Hi, You can try to update FoxTab via '''Tools''' ('''Alt''' + '''T''') > '''Add-ons''' > '''Extensions''' (on the left), right-click the name and '''Find Updates'''. Clicking on '''More''' and '''Homepage''' would take you to the add-on site. You can also try to update all the add-ons by clicking on the gear on the top right and '''Check for updates'''. If the problem persists, please try to '''Remove''' it and [https://addons.mozilla.org/en-US/firefox/addon/foxtab/?src=search '''Add to Firefox'''] again. [http://www.foxtab.com/support/ Support]